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<blockquote data-quote="timetraveller" data-source="post: 73683" data-attributes="member: 456"><p>A few notes concerning yesterday at Goodwood; there were three Vincents racing. The first was a Grey Flash (replica) owned by a gentleman from Dorset who's name I don't have. The engine had been guilt by Mike Hawthorn. The bike went well but did not finish as it lost compression after many laps and it is assumed that either the piston or a valve has failed. The second was a twin, owned and ridden by Patrick Walker (no relation). This bike showed a good turn of speed but eventually succumbed to clutch slip. The clutch is a multi-plate one bought from the Spares Company and on dismantling did not show any signs of oil or wear. My guess is that stronger springs are needed to cope with the extra power as the force required on the handlebar lever was very light. Finally there was the Robert Lusk twin, which I help out with occasionally. This was lying third in the race and had put up the second fasted lap time when the gear change linkage came loose. This was fixed on the day but there was no more racing for bikes yesterday. Vibrac will be happy to know that they use straight 40 grade Castor oil for lubrication. Today is forecast to be wet. Both the twins use the John Emmanuel modification on their steering heads and the Flash owner immediately ordered one. More noteworthy is that Patrick Walker does not use any form of steering damper, friction or hydraulic, and finds that the bike handles well enough. The 30 lbs/inch springs on the front of the Robert Lusk twin seem to be about right but a bit more testing will be required to show up whether they will do for the rest of us. Note that these bikes probably weigh less than a fully equipped road going Comet so we are homing in on what will be required for those with this steering head mod.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 73683, member: 456"] A few notes concerning yesterday at Goodwood; there were three Vincents racing. The first was a Grey Flash (replica) owned by a gentleman from Dorset who's name I don't have. The engine had been guilt by Mike Hawthorn. The bike went well but did not finish as it lost compression after many laps and it is assumed that either the piston or a valve has failed. The second was a twin, owned and ridden by Patrick Walker (no relation). This bike showed a good turn of speed but eventually succumbed to clutch slip. The clutch is a multi-plate one bought from the Spares Company and on dismantling did not show any signs of oil or wear. My guess is that stronger springs are needed to cope with the extra power as the force required on the handlebar lever was very light. Finally there was the Robert Lusk twin, which I help out with occasionally. This was lying third in the race and had put up the second fasted lap time when the gear change linkage came loose. This was fixed on the day but there was no more racing for bikes yesterday. Vibrac will be happy to know that they use straight 40 grade Castor oil for lubrication. Today is forecast to be wet. Both the twins use the John Emmanuel modification on their steering heads and the Flash owner immediately ordered one. More noteworthy is that Patrick Walker does not use any form of steering damper, friction or hydraulic, and finds that the bike handles well enough. The 30 lbs/inch springs on the front of the Robert Lusk twin seem to be about right but a bit more testing will be required to show up whether they will do for the rest of us. Note that these bikes probably weigh less than a fully equipped road going Comet so we are homing in on what will be required for those with this steering head mod. [/QUOTE]
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